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Listing individual average price [message #652479]

Thu, 09 June 2016 16:43

misy
Messages: 5
Registered: June 2016

Junior Member

I have 3 tables

Book
BookID
SalesPrice
WorkID

Author
AuthorID
Lastname
Firstname

Work
WorkID
Description
AuthorID

Question: How can I list individual author on their average sales price? I'm aint sure how to place the avg code.

My code:

SELECT Lastname,Firstname,Salesprice
FROM Author A JOIN Work W on A.AuthorID = W.WorkID
JOIN Book B on B.WorkID = W.WorkID
WHERE W.WorkID = B.Work ID

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Re: Listing individual average price [message #652480 is a reply to message #652479]

Thu, 09 June 2016 18:05

Barbara Boehmer
Messages: 9106
Registered: November 2002
Location: California, USA

Senior Member

Use

AVG(Salesprice)

instead of

Salesprice

and remember to GROUP BY any other columns, like Lastname and Firstname, at the end of your code.

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Re: Listing individual average price [message #652481 is a reply to message #652480]

Thu, 09 June 2016 19:26

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

Please read OraFAQ Forum Guide and How to use [code] tags and make your code easier to read.

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Re: Listing individual average price [message #652506 is a reply to message #652480]

Fri, 10 June 2016 12:00

misy
Messages: 5
Registered: June 2016

Junior Member

Thank you. It works.

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